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研究了共沉淀分解法制备的ZnCo_2O_4纳米粒子的光学和可见光催化性能,并对其晶体结构和微观结构用X射线衍射、热重/差热分析、透射电镜和高分辨透射电镜等手段进行了表征.结果表明,制备的纳米粒子为纯相的ZnCO_2O_4,平均粒径约为10-20 nm.紫外-可见吸收光谱估计出ZnCo_2O_4纳米粒子的能带隙为3.39和2.09 eV.可见光(λ>420 nm)照射下,纳米粒子表现出降解亚甲基蓝溶液的光催化活性.ZnCo_2O_4纳米粒子的光催化活性可以归结为紫外和可见光下纳米粒子吸收光子(能量大于能带隙)的能力,以及它们的纳米尺寸,基于实验结果,本文提出了ZnCO_2O_4可能的能带结构.
The optical and visible light catalytic properties of ZnCo_2O_4 nanoparticles prepared by coprecipitation decomposition were studied. The crystal structure and microstructure were characterized by X-ray diffraction, TG-DTA, TEM and high-resolution transmission electron microscopy The results showed that the prepared nanoparticles were pure ZnCO_2O_4 and the average particle size was about 10-20 nm.The energy bandgap of ZnCo_2O_4 nanoparticles was estimated to be 3.39 and 2.09 eV by UV-Vis absorption spectroscopy.The visible light (λ> 420 nm ), The photocatalytic activity of the nanometer particles degrades methylene blue solution.The photocatalytic activity of ZnCo 2 O 4 nanoparticles can be attributed to the ability of the nanoparticles to absorb photons (energy is greater than the bandgap) in UV and visible light, as well as their nanometer size, Based on the experimental results, we propose a possible band structure of ZnCO_2O_4.